Submission #1033323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033323		happy_node	Counting Mushrooms (IOI20_mushrooms)	C++17	76.09 / 100	8 ms	852 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;

const int B=100;

int count_mushrooms(int N) {
	vector<int> posA, posB;
	posA.push_back(0);
 
	for(int i=1;i<min(N,B);i++) {
		if(use_machine({0,i})==0) posA.push_back(i);
		else posB.push_back(i);
	}
 
	int ans=posA.size();

	for(int i=B;i<N;i++) {
		if(posA.size()>posB.size()) {
			int s=posA.size();
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posA[j-i]);
				qry.push_back(j);
			}	

			int w=use_machine(qry);
			if(w&1) posB.push_back(qry.back());
			else posA.push_back(qry.back());

			w=(w+1)/2;
			ans+=(qry.size()/2-w);
			i+=s-1;
		} else {
			int s=posB.size();
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posB[j-i]);
				qry.push_back(j);
			}	
			int w=use_machine(qry);
			if(w&1) posA.push_back(qry.back());
			else posB.push_back(qry.back());

			w=(w+1)/2;
			ans+=w;
			i+=s-1;
		}
	}
 
	return ans;
}

• Subtask 1: 76.0943 / 100